Environmental science Unit 4

Which of the following is not a way that nonnative organisms are introduced to new aquatic ecosystems related to commerce?

• cargo ship hulls

• recreational boats

• escape from aquariums

• migration

Succession occurs after ecosystems experience some type of disruptive event.

• True

• False

Which of the following is not a characteristic of a climax community?

• high levels of biodiversity

• presence of complex organisms

• conditions suitable for all organisms

• experiences no change

There are approximately 80,052,500 individuals of green tree frog, up from 76,500,432, surveyed within a 30,000 square foot area in the South American Rain forest. What is the population density of the green tree frog?

• 2,668 per square mile

• 2,488 per square mile

• 4.43 per square mile

• 2,488.41 per square mile

Which method to determine population size is the most invasive?

• mark/recapture

• direct observation

• sampling

• indirect observation

Succession is ________.

• harmful to ecosystems

• a natural recovery process

• unnecessary for ecosystem recovery

• a one-time event

The ________ is the total number of organisms that an ecosystem can support.

Lions live in groups called prides. Lion populations would most likely fall in which category of population distribution?

• even

• random

• clumped

• density

Which of the following is not a factor that can influence population distribution?

• Availability of resources

• Climate conditions

• Interactions between species

• Morphology

What is the impact of introducing nonnative species to a new ecosystem?

• It always leads to the extinction of native species.

• It has no impact on the ecosystem.

• It can disrupt the balance of the ecosystem and harm native species.

• It increases the biodiversity and makes the ecosystem healthier.